Manufacturer benchmarks have always been like Tinder profile pictures - under certain highly specific conditions, in the right lighting, when all the stars align perfectly, and you're blind-drunk/on multiple hallucinogenic substances, the real-life experience may match what you've been shown.
But under normal conditions?
It's advertising. Have you ever seen a Big Mac look anything like they do in the commercials? Of course not, because those are made of wax, by master artisans, and then digitally enhanced for maximum hunger appeal.
Chip makers will always put out some sort of graph that makes their product look like it comes with a complimentary second coming of Jesus, and he's even brought you a sandwich, just in case you get hungry as you float up to heaven for an eternity of never-ending bliss.
No one expects these things to be realistic, except for those with exceptionally poor highly judgement and a highly tenuous grip on reality. You see these things and go "Hey, look, another chip - can't wait to see what the real-world performance looks like once it gets reviewed."
Their marketing department has to put out these graphs, because if they don't, people will accuse them of having something to hide. And they have to show performance exceeding their competitors, or some poor soul in the marketing department will end up ritually dismembered, desecrated, and their head put on a pike, as a warning to the others.
And before you ask, yes, marketing people do in fact have souls; I've confirmed this by tearing out and eating several. They taste like the content of that container of carry out Chinese food that's been in the back of your fridge since before you moved in, but they do exist.
Anyway - advertising has two purposes: to inform/remind you that a product or service exists, and to convince you to buy it. Notice how conveying factual information isn't in there? That's intentional.
Advertising was the created through a cooperative effort between Belial, Lord of Lies, and Beelzebub, Lord of flies. Hence, its fundamentally rotten, stinky and non-factual nature. "Truth in Advertising" is like "Ethics in Politics" - there might be a little in there somewhere, but it being there was definitely an accident.